Process for fireproofing wood.



i 106. COMPOSITIONS,

' COATING R PLASTIC.

UNITE s'rn Es PATENT OFFICE.

CLYDE H. TEESDALE, 0F MADISON, WISCONSIN, AND ROBERT E. PRINCE, OF ELGIN, ILLINOIS, DEDICATED, BY MESN E ASSIGNMENTS, TO THE GOVERNMENT OF THE UNITED STATES AND THE PEOPLE THEREOF.

PROCESS FOR FIREPROOFING WOOD.

No Drawing.

Specification of Letters Patent.

Patented May '7, 1918.

Application filed. January 23, 1917. Serial No. 144,098.

To all whom it may concern:

Be it known that we, CLYDE H. Tnns- DALE, a citizen of the United States of America, and an employee of the Department of Agriculture of the said United States, residing at Madison, in the county of Dane, State of Wisconsin, (whose post-office address is Madison, Wisconsin,) and ROBERT E. PRINCE, a citizen of the United States of America, and formerly an employee of the Department of Agriculture of the said United States, residing at Elgin, in the county of Kane, State of Illinois, (whose post-office address is Elgin, Illinois,) have invented a new and useful Process for Fireproofing WVood.

This application is made under the act of March 3, 1883, chapter 143 (22 Stat, 625), and the invention herein described and claimed may be used by the Government of the United States or any of its oflicers or employees in the prosecution of work for the Government or any person in the United States without payment to us of any royalty thereon.

Our invention relates to the fireproofing of wood or other material by treating the wood or other material with any insoluble borate when mixed with oil or water paints.

The mode of working our said process is as follows: We find that any borate fusing below 1000 F., as zinc borate, when ground in oil or water, either with or without mixture with other paint pigments, will fireproof the wood or other material so as to render it non-adaptable for carrying flame. It is desirable to use a borate that is less than 1.0 per cent. soluble in water, as soluble borates would be leached out of the film when exposed to the Weather, and thus injure the durability of the paint. In practice we find that zinc borate is the most suitable for this purpose because of its being a complicated salt of zinc and borax containing an oxychlorid group, is nearly insoluble in water and fuses at a suitable temperature to afford protection from fire.

From two to seven pounds of borate should be used with each gallon of oil depending upon the kind of pigment used. Either before or after mixing, the borate is ground in oil preferably linseed oil. The resulting product is applied to the wood or other inflammable material either by applying the paint with a brush, by spraying paint upon the surface of the material or by immersing the wood or other material in the paint.

Having thus described our invention we claim:

,3 A paint consisting of zinc borajge...mixed iyvith any other pigmenmfid ground in a rying oil. In witness whereof, we aflix our signature in the presence of two subscribing witnesses.

' CLYDE H. TEESDALE.

ROBERT E. PRINCE. Witnesses:

ARTHUR H. FAST, WM. J. BYRNE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, .D. 0. 

